JPH06259703A - Rotary head drum - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of the rotary head drum and reduce the signal loss, and to facilitate the multi-channelization of the small drum. [Structure] A connector 4 including a cylindrical casing 5, a contact pin 7 and a coil spring 8 is arranged between a connecting portion 2 of a head base 33 and a transformer substrate 1. Since the connector 4 is directly connected to the land serving as the terminal between the connecting portion 2 and the transformer substrate 1, the configuration is simplified, the installation space can be reduced, and the rotary head drum can be manufactured inexpensively and in a small size. Further, since the installation space for the connector 4 can be reduced, a plurality of connectors 4 can be arranged even in a small drum, and the number of channels in the small drum can be easily increased. further,
Since the connector 4 directly connects the connecting portion 2 and the transformer substrate 1, the signal path becomes shorter and the signal loss can be reduced as compared with the conventional soldering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is, for example, a VTR, R-
The present invention relates to a rotary head drum suitable for application to DAT (rotary digital audio tape recorder) and the like.

[0002]

2. Description of the Related Art In a VTR or the like, signals are exchanged between a rotary head and a video board via a rotary transformer arranged between the rotary head and the video board. FIG. 2 is a sectional view of a rotary head drum of a conventional VTR.

In the figure, reference numeral 10 is a motor base, and this motor base 10 is fixed to a drum base (mechanical chassis) not shown. A lower drum 11 is fixed to the motor base 10 with a plurality of bolts 12 (two bolts are shown in FIG. 2). It should be noted that the lower drum 11 is provided with leads 11a for positioning the upper and lower positions of the tape (not shown).

Reference numeral 13 is a rotary shaft (hereinafter referred to as "shaft"), and the shaft 13 is received by a pair of bearings 14 fixed to the lower drum 11. Reference numeral 15 is a spring, and the spring 15 is elastically mounted between the bearings 14. Spring 15
Is for preloading the bearing 14.

Reference numeral 17 is a video board. The video board 17 is fixed between the lower drum 11 and the mounting plate 18 with bolts 19. Then, attach the video board 17 to the bolt 19
It is grounded by being fixed to the lower drum 11 via.

Reference numeral 21 denotes an upper drum, and this upper drum 21
Is fixed to the upper end of the shaft 13. Reference numeral 22 denotes a disc, and the disc 22 is fixed to the upper drum 21 with bolts 23 (two are shown in FIG. 2).

Reference numeral 24 is a rotary transformer, which is composed of a rotor transformer 24a and a stator transformer 24b. The rotor transformer 24a is fixed to the disc 22 with an adhesive or the like. Further, the stator transformer 24b is used for the lower drum 2
It is fixed to 1 with an adhesive or the like.

25A and 27A are mounting plates, and the mounting plate 2
5A is fixed to the stator transformer 24b with an adhesive or the like. The mounting plate 27A is fixed to the rotor transformer 24a with an adhesive or the like. 25 and 27 are connectors of the rotary transformer 24.
Pins 25a and 27a and coils 26 and 28 are respectively arranged in the.

The connector 25 is fixed to the mounting plate 25A. Further, the connector 27 is a mounting plate 27A.
It is fixed to. The pin 25 a of the connector 25 projects from the video board 17, and the pin 27 a of the connector 27
Protrudes from the upper drum 21. The connector 25
The outer surface of the pin 25a is plated with gold,
Good contact with the video board 17 is provided.

Reference numeral 31 is a relay board, and the relay board 31 is fixed to the upper drum 21 with an adhesive or the like. 32
Is a rotary head (hereinafter referred to as “head”), and this head 32 is fixed to a head base 33. The head base 33 is fixed to the upper drum 21 with bolts 34.

A plurality of heads 32 are arranged on the upper drum 21 (only one is shown in the figure). Therefore, the connectors 27 and 35 (described later) are also arranged so as to correspond to each other. Although not shown, the upper drum 21 is provided with bolts for adjusting the height position of the head 32.

Reference numeral 35 denotes a connector, and this connector 35
A pin 36 is fixed to the. The connector 35 is press fitted into the upper drum 21 and the head base 33. The upper end portion 36 a of the pin 36 projects from the relay board 31. Further, the lower end portion 36 b of the pin 36 is bent into a substantially L shape so as to come into contact with the head base 33.

Then, the head base 33 and the lower end portion 36b of the pin 36, the upper end portion 36a of the pin 36 and the relay board 31.
Also, the relay board 31 and the pin 27a of the connector 27 are
Soldered to ensure the reliability (reliability) of connection with each land. Further, as described above, since a plurality of heads 32 are arranged, they are soldered correspondingly. Here, the rotor transformer 24a and the head base 33 are not directly connected to each other because the head 32 is adjusted while the rotor transformer 24a is assembled after the rotor transformer 24a is assembled in order to maintain the positional precision such as the height and the electrical precision.
For assembling. Further, when the rotor transformer 24a and the head base 32 are directly connected by soldering or the like,
This is because it becomes difficult to replace the head 32 and the like.

The rotary head drum of this embodiment is of a motor integrated type. The configuration of this motor will be described below. 40 is a rotor, and a fixing piece 41 of the rotor 40 is fixed to the lower end of the shaft 13. A rotor case 42 in which a magnet 43 is arranged is fixed to the fixing piece 41.

Reference numeral 44 is a back yoke, and this back yoke 44 is fixed to the motor base 10 with screws 45. 46 is a printed circuit board, and this printed circuit board 46
, A plurality of stator coils 47 are arranged so as to face the magnet 43 at a predetermined interval. Although not shown, an FG (frequency generator) and a PG (pulse generator) are arranged.

The direction and timing of the current flowing through each stator coil 47 are controlled according to the output patterns of FG and PG, and the rotation speed and rotation phase of the rotor 40 are controlled.

The rotation of the shaft 13 causes the upper drum 21 and the disk 22 fixed to the shaft 13 to rotate. That is, the rotor transformer 24a, the head 32, etc. rotate.
As a result, the recording or reproducing signal is transmitted to the connector 35,
It is supplied to the rotor transformer 24a via the relay board 31 and the connector 27. In addition, the signal is the rotor transformer 2
4a to the video board 17 through the stator transformer 24b and the connector 25. The motor base 1
Lower drum 11 and stator transformer 2 fixed to 0
4b does not rotate.

[0018]

As described above, the signal path between the head 32 and the rotor transformer 24a includes the head base 33, the pins 36 of the connector 35, and the relay board 31.
And a pin 27a of the connector 27. Therefore, the structure is complicated, the number of parts is large, and the cost is high. Moreover, since the signal path becomes long, signal loss easily occurs. Further, the head base 33 and the lower end portion 36 b of the pin 36 of the connector 35, and the upper end portion 36 of the pin 36.
a and the relay board 31 and the relay board 31 and the connector 2
Since each of the seven pins 27a is soldered, the number of places to be soldered is increased, and the assembly work is troublesome.

In order to solve this problem, a method of directly connecting the head base 33 and the rotor transformer 24a in consideration of the positional accuracy of the rotor transformer 24a and the head base 33 described above, for example, an elastic connector. (For example, multiple thin copper wires serving as conductors are arranged on silicon rubber, and both ends of this copper wire are made to protrude by pressing the silicon rubber.) To be

By the way, in the elastic connector, since the copper wire is formed thin, it is necessary to widen the area of the silicone rubber in order to ensure conduction to the copper wire. If the area is widened, the elastic connector becomes large. Further, since the area of the silicone rubber becomes large, the head base 33 and the rotor transformer 24a must be pressed in order to apply pressure to the silicone rubber to cause both ends of the copper wire to come out.
The contact pressure with must be increased. However, if the contact pressure is increased, as described above, the rotor transformer 24
Since a is bonded to the disk 22 with an adhesive or the like, the rotor transformer 24a may be separated from the disk 22, and the design of the rotary head drum is relatively difficult.

Further, in the case of the leaf spring structure, it is necessary to set a large contact pressure in order to ensure the contact between the head base 33 and the rotor transformer 24a. Further, in order to increase the contact pressure, the leaf spring must be lengthened and the leaf spring structure becomes relatively large, which is difficult to apply to a small drum. Further, when a plurality of heads 32 are arranged to increase the number of channels, it is necessary to arrange a connector (connecting member) for relaying the signal. Therefore, as described above, it is difficult to manufacture and miniaturize the method of directly connecting the head base 33 and the rotor transformer 24a.

Therefore, an object of the present invention is to reduce the size of the rotary head drum and reduce the signal loss, and to facilitate the multichannel of the small drum.

[0023]

SUMMARY OF THE INVENTION In the present invention, a connector is provided in which a contact pin is movably arranged in a cylindrical casing and a biasing means for urging the contact pin is arranged in a head base and a rotary. It is arranged between a transformer substrate and a terminal of the head base and the terminal of the rotary transformer substrate by a connector.

[0024]

The contact pin 7 is movably arranged on the housing 5, and the biasing means for biasing the contact pin 7, for example, the coil spring 8 is provided.
Since the connector is arranged, the connector 4 can be downsized.
When the coil spring 8 is used as the urging means, the urging force can be arbitrarily set with the contact surface of the coil spring 8 kept small. Therefore, unlike the elastic connector, it is not necessary to apply more pressure than necessary, so there is no concern that the rotary transformer 24 will peel off.

Since the connector 4 is directly connected to the connecting portion 2 which serves as the terminal of the head base 33 and the transformer substrate 1 which serves as the terminal of the rotary transformer 24, the structure is simplified and the installation space can be reduced. Therefore, the rotary head drum can be manufactured inexpensively and in a small size. Further, since the installation space for the connector 4 can be reduced, a plurality of connectors 4 can be arranged even in a small drum, and the number of channels in the small drum can be easily increased. Further, since the connector 4 directly connects the connecting portion 2 and the transformer substrate 1, the signal path becomes shorter than that in the conventional soldering, and the signal loss can be reduced.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. This example is an example applied to the rotary head drum of the VTR shown in FIG. 1, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 1 is a transformer substrate,
The transformer substrate 1 is adhered to the upper surface of the rotor transformer 24a with an adhesive or the like. Reference numeral 2 denotes a connection portion of the head base 1, and the connection portion 2 is provided on the lower surface of the head base 33 so as to project. Then, the transformer substrate 1 and the connecting portion 2 are arranged so as to face each other. The transformer substrate 1 and the connecting portion 2 are each formed with a land (not shown) that serves as a terminal.

Reference numeral 3 denotes a pin holder which is a holding member, and the pin holder 3 is for holding a connector 4 which will be described later. Although not shown, the pin holder 3 is fixed to the upper drum 21, and the rotor transformer 24
a is bonded with an adhesive or the like. Therefore, the upper drum 21
When the (head 32) rotates, the pin holder 3 and the rotor transformer 24a also rotate integrally. Further, the pin holder 3 is arranged between the transformer substrate 1 and the connecting portion 2.

The pin holder 3 is made of an insulating material. Also, the pin holder 3 has a hole 3a formed therein,
The hole 3a is formed in the same direction (vertical direction) as the axis of the shaft 13 so that the transformer substrate 1 and the connecting portion 2 face each other.

Reference numeral 4 denotes a connector, which is a cylindrical casing 5, a contact pin 7, and a coil spring 8 as a biasing means.
Composed of and. Case 5, contact pin 7, coil spring 8
Has a gold-plated surface for conductivity.

The connector 4 is vertically movably inserted into the hole 3a of the pin holder 3. That is, the connector 4 is arranged so that the upper and lower openings 5 a and 5 b of the housing 5 face the transformer substrate 1 and the connecting portion 2, respectively.
Further, the connector 4 is arranged to be movable up and down in order to keep the land contact between the housing 5 and the transformer substrate 1 always good.

The contact pin 7 is arranged in the housing 5 so as to be vertically movable. The contact pin 7 is integrally formed with a stopper portion 7a, and a tapered pin portion 7b and a pin-shaped spring receiving portion 7c with the stopper portion 7a interposed therebetween. Stopper 7a
Is configured so as to be in contact with the housing 5 and to be conductive.

The stopper portion 7a is formed so as to have a diameter larger than that of the pin portion 7b and the spring receiving portion 7c. It is configured so as not to come off from the housing 5.

The coil spring 8 is inserted into the spring receiving portion 7c so that the lower portion of the housing 5 and the stopper portion 7a of the contact pin 7 are inserted.
It is loaded with and. Therefore, the contact pin 7 is always urged toward the connecting portion 2 and protrudes from the opening 5 a of the housing 5 by the pin portion 7.
b is pressed against the land of the connecting portion 2. Also, the coil spring 8
The contact pin 7 and the housing 5 are electrically connected via the.

Reference numeral 9 is a bolt for adjusting the height position of the head base 33 (head 32). The bolt 9 is arranged on the upper drum 21. In this example, members corresponding to the relay board 31 and the disk 22 shown in FIG. 2 are not arranged.

The present example is constructed as described above, and the other points are the same as the example of FIG. The connector 4 of this example
May be applied to the connection between the stator transformer 24b and the video board 17.

In this example, the signals from the head 32 or the rotary transformer 24 are respectively transmitted via the connector 4. That is, a signal from the head 32 to the rotary transformer 24 passes from the land of the connecting portion 2 through the pin portion 7b of the contact pin 7, the stopper portion 7a, the coil spring 8, the land of the transformer substrate 1 via the housing 5, and the rotor transformer 24a. Is supplied to. Further, the signal is supplied from the rotor transformer 24a to the video board 17 (see FIG. 2) via the stator transformer 24b. Further, the signal from the rotary transformer 24 to the head 32 goes through the reverse path.

According to this embodiment, the contact pin 7 is movably arranged on the housing 5 and the coil spring 8 for urging the contact pin 7 is arranged. Therefore, the connector 4 can be miniaturized. That is, according to this example, since the connector 4 is directly connected to the connecting portion 2 of the head base 33 and the transformer substrate 1 of the rotary transformer 24, the configuration can be simplified and the installation space can be reduced. Therefore, according to this example, the rotary head drum can be manufactured inexpensively and in a small size.

Further, according to this example, since the installation space for the connector 4 can be reduced, a plurality of connectors 4 can be arranged even in a small drum, and it is easy to provide multiple channels in the small drum. Furthermore, according to this example,
Since the connector 4 directly connects the connecting portion 2 and the transformer substrate 1, the signal path becomes shorter and the signal loss can be reduced as compared with the conventional soldering.

Furthermore, according to this example, the biasing force can be set arbitrarily while the contact surface of the coil spring 8 is kept small. Therefore, according to this example, it is not necessary to apply a pressure more than necessary unlike the elastic connector, and therefore the transformer substrate 1 and the rotor transformer 24a are not separated by the contact pressure of the contact pin 7. Further, according to this example, the assembly and replacement of the head 32 (head base 33) and the like do not require soldering as in the conventional case, and
Since it can be performed without attaching or detaching the connector 4, assembly and replacement can be facilitated.

The rotary head drum of this embodiment is an example applied to a VTR, but the present invention can be similarly applied to, for example, an R-DAT.

[0042]

According to the present invention, since the contact pin is movably arranged on the housing and the urging means for urging the contact pin, for example, the coil spring is arranged, the connector can be miniaturized. Further, according to the present invention, when the biasing means is the coil spring, it is not necessary to apply a pressure more than necessary unlike the elastic connector, so that there is no fear that the rotary transformer is peeled off.

According to the present invention, since the connector is directly connected to the terminal of the head base and the terminal of the rotary transformer substrate, the structure can be simplified and the installation space can be reduced. Therefore, according to the present invention, the rotary head drum can be manufactured inexpensively and in a small size. Further, according to the present invention, since the installation space of the connector can be reduced, a plurality of connectors can be arranged even in a small drum, and the number of channels in the small drum can be easily increased. Furthermore, according to the present invention, since the connector directly connects the terminal of the head base and the terminal of the rotary transformer substrate, the signal path becomes shorter than that in the conventional soldering, and the signal loss can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a rotary head drum of an embodiment.

FIG. 2 is a sectional view of a conventional rotary head drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer substrate 2 Head base connection part 3 Pin holder 4 Connector 5 Housing 7 Contact pin 7b Pin part 8 Coil spring 11 Lower drum 13 Rotating shaft 21 Upper drum 24 Rotary transformer 24a Rotor transformer 24b Stator transformer 32 Rotating head 33 Head base

Claims (4)

[Claims] 1. A connector comprising a contact pin movably arranged in a cylindrical casing and a biasing means for biasing the contact pin, disposed between the head base and the rotary transformer substrate. A rotary head drum, wherein the terminal of the head base and the terminal of the rotary transformer substrate are connected by the connector. 2. The rotary head drum according to claim 1, wherein the biasing means is a coil spring. 3. The rotary head drum according to claim 1, wherein at least a portion of the connector that contacts the terminal of the head base and the terminal of the rotary transformer substrate is plated with gold. 4. The rotary head drum according to claim 1, wherein the connector is held by an insulating hold member.